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The main objective of the present work was to develop intumescent fire-retardant coating (IFRC) for wood based on modified natural rubber (NR). A newly modified form of NR, namely graft copolymers of NR and poly(methacrylic acid) (PMAA), NR-g-PMAA, was first synthesized by a solution polymerization technique. The IFRC was then prepared by compounding the synthesized NR-g-PMAA with a curing agent and an intumescent additive to form a compound coating. Cross-linking of the NR-g-PMAA coating was achieved by reactions with polyisocyanate based on hexamethylene diisocyanate (poly‐HDI) under ambient conditions. Interactions of NR-g-PMAA with poly‐HDI were also studied using X-ray photoelectron spectroscopy. Expandable graphite (EG) was employed as intumescent filler in the present study. The thermal stability of the NR-g-PMAA coating films was first studied by thermogravimetric analysis. The fire-retardant properties of wood, with or without the NR-g-PMAA coating, were then examined using the limiting oxygen index and cone calorimetry test. The flammability tests indicate that the flame-retardant properties of wood were greatly improved by treatment with the NR-g-PMAA-based IFRC. Hence, it can be stated that this new form of modified NR has shown to possess potential application in the IFRC when used in combination with EG.

Fire-retardant wood coating based on natural rubber bearing methacrylic functionality